US5354587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic compositions with increased thermal and solvent resistance
Assignee: W.L. Gore and Associates Inc
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Filing: 1993-11-15
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Granted: 1994-10-11
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Expires: 2013-11-15
Abstract
Abstract A fluid filtration material made of a porous substrate, e,g. a membrane or a fabric that is coated with a fluorinated copolymer that contains recurring vinyl alcohol units to impart hydrophilicity. The material is crosslinked with multifunctional epoxides to maintain hydrophilicity on exposure to heat or solvent.
Inventors
- 👤 Dilip R. Abayasekara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D19/00; B01D19/0031; C; C08; C08F; C08F8/00; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/405; C08F2810/00; C08F2810/20; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T442/00; Y10T442/20; Y10T442/2484
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
A hydrophilic, fluid permeable material comprising a substrate having continuous pores through it in which at least a portion of the interior of the substrate is coated with a copolymer of a fluorinated ethylenically unsaturated monomer and vinyl alcohol, wherein the vinyl alcohol units are cross-linked with a multifunctional epoxide, containing at least two functional groups.
Claim 2
Dependent Claim
56 words
A hydrophilic, fluid permeable material comprising a substrate having continuous pores through it in which at least a portion of the interior of the substrate is coated with a copolymer of a fluorinated ethylenically unsaturated monomer and vinyl alcohol, wherein the vinyl alcohol units are cross-linked with a multifunctional epoxide, containing at least two functional groups.
Claim 3
Dependent Claim
25 words
The material of claim 1 in which the substrate is flexible and is in the form of a fabric, sheet, film, tube, mesh or plug.
Claim 4
Dependent Claim
18 words
The material of claim 2 in which the substrate is comprised of a synthetic polymer or natural polymer.
Claim 5
Dependent Claim
14 words
The material of claim 1 in which the substrate is comprised of a fluoropolymer.
Claim 6
Dependent Claim
11 words
The material of claim 4 in which the fluoropolymer is polytetrafluoroethylene.
Claim 7
Dependent Claim
17 words
The material of claim 1 in which the fluorinated ethylenically unsaturated monomer in the copolymer is tetrafluoroethylene.
Claim 8
Dependent Claim
12 words
The material of claim 1 wherein the epoxide is a diglycidyl epoxide.
Claim 9
Dependent Claim
24 words
The material of claim 1 wherein the epoxide is selected from the class consisting of ethylene glycol diglycidyl ether, and 1,4-butane diol diglycidyl ether.
References Cited (Backward Citations)
US4557955A
Cited
US4778596A
Cited
US4851472A
Cited
US5173556A
Cited
US5032282A
Cited
US5130024A
Cited
US5053470A
Cited
US5194543A
Cited
US5200442A
Cited
US5219927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-10 | 1998-04-11 | 1998-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-10 | 2002-04-11 | 2002-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-10 | 2006-04-11 | 2006-10-11 | $7700.00 | Window Closed / Lapsed |